$ sudo apt-get remove libkdewebkit5 

Uninstall libkdewebkit5 including dependent package

If you would like to remove libkdewebkit5 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libkdewebkit5 

Use Purging libkdewebkit5

If you use with purge options to libkdewebkit5 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libkdewebkit5 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove libkdewebkit5 

See Also,